Monitoring Static or Dynamic Entries of the IPv6 Neighbor Discovery Cache

Purpose

Display IPv6 Neighbor Discovery cache information static entries, dynamic entries, or both:

Note:

  • You must configure an IPv6 license using the license ipv6 command before using the IPv6 routing protocol configuration commands on the E Series router.
  • All IPv6 routing protocol-related configurations are removed from the virtual router when you issue the no ipv6 command.

Action

To display both static and dynamic entries from the IPv6 Neighbor Discovery cache:

host1# show ipv6 neighbors
   Interface         IPv6-Address    Type   Hardware Addr  State  Age 
----------------- ----------------- ------- -------------- ----- -----
FastEthernet4/1        1::1          dynamic 0090.1a40.05e5 reach 3 

To display summary information of both static and dynamic entries from the IPv6 Neighbor Discovery cache:

host1# show ipv6 neighbors summary
Total IPv6 neighbors: 7
By type: 5 global, 2 link-local, 0 anycast, 0 unknown
By state: 5 reachable, 0 incomplete, 2 stale, 0 probe, 0 delay, 0 init
IPv6 address conflicts: 0 during DAD resolution, 0 after DAD resolution

Meaning

Table 40 lists the show ipv6 neighbors command output fields.

Table 40: show ipv6 neighbors Output Fields

Field Name

Field Description

Interface

Neighbor interface

IPv6-Address

IPv6 address for the interface

Type

Type of interface (dynamic, static)

Hardware Addr

Layer 2 address of the interface

State

State of the interface (delay, incomplete, probe, reachable, stale)

Age

Amount of time (in seconds) since the router contacted the neighbor

Total IPv6 neighbors

Total number of IPv6 neighbors

By type

List by neighbor type (global, link-local, anycast, and unknown)

By state

List by neighbor state (reachable, incomplete, stale, probe, delay, an init)

IPv6 address conflicts

Number of conflicts during or after duplicate address detection resolution

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